callstack
Apex
Use an endpoint supported by this model.
Get a key for this setup →const response = await fetch('https://api.minirouter.sh/v1/chat/completions', { method: 'POST', headers: { Authorization: `Bearer ${process.env.MINIROUTER_KEY}`, 'Content-Type': 'application/json', }, body: JSON.stringify({ model: 'callstack/apex', messages: [{ role: 'user', content: 'Why is the sky blue?' }], max_tokens: 1024, }),}) const data = await response.json()console.log(data.choices[0].message.content)- Input / 1M
- $0.525
- Output / 1M
- $3.15
- Context
- 262K
- Max output
- 131K
Overview
Overview
Apex is Callstack’s agentic coding model for mobile and web development, optimized for React Native, React, and Next.js. With a 256K context window, it supports feature development, debugging, code reviews, testing, and large refactors.
- Model type
- language
- Context window
- 262,144
- Maximum output
- 131,072
- Input / 1M tokens
- $0.525
- Output / 1M tokens
- $3.15
- Released
- 2026-10-08
Prices include the MiniRouter fee. Compatibility snapshot: 2026-08-06. Input: text, image. Output: text.
Endpoints
Endpoints
Platform-funded routing only. Caller BYOK credentials and OIDC-based upstream authentication are intentionally excluded; authenticate with a MiniRouter bearer key.
Paths
/v1/chat/completions/v1/messages/v1/responsesStructured output
Not enforced; a requested format is dropped and the answer is plain text. How it works
Captured parameters: max_tokens, temperature, stop, tools, tool_choice, reasoning, include_reasoning.
API
API
Switch between Chat Completions, Messages and client configurations in the setup panel. Every snippet keeps the model ID unchanged.
Base URL
https://api.minirouter.sh/v1Model ID
callstack/apexProviders
Providers
MiniRouter selects from the configured routes below. Priority is the catalog order, not a latency or availability score.
| Provider | Priority | Input / 1M | Output / 1M | Parameters | Access |
|---|---|---|---|---|---|
vercel | 1 | $0.525 | $3.15 | max_tokens, temperature, stop, tools, tool_choice, reasoning, include_reasoning | MiniRouter balance |